encrypt_size
cipherlen = encrypt_size(&tmi->enc_data, inlen);
cipherlen = encrypt_size(&tmi->enc_data, inlen);
cipherlen = encrypt_size(&tmi->enc_data, inlen);
cipherlen = encrypt_size(&tmi->enc_data, (size_t)ptlen);
tmi->rcmd_state.cd_len = encrypt_size(&tmi->dec_data, elen);